Halo Infinite has an Easter egg that pays tribute to the original Xbox console, and it'll take you straight back to LAN parties in the early 2000s.
As seen in this video from xGarbett, the Easter egg would be almost impossible to find if you weren't actively looking for it. Tucked away in the roof of a structure in the southern part of the map is a small hole between some stone and steel, and it's there that you'll want to aim your Grappleshot and pull yourself up to. What you'll find is a small room basking in the green glow of an original Xbox console and period-accurate TV/monitor. It's a pretty bare bones setup, featuring a utilitarian crate as a desk and a few folding chairs as seats, but it looks like a suitable place to gather a few friends for some multiplayer fun.
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